package com.cuit.reggie.controller;

import com.cuit.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.util.UUID;

/**
 * 文件上传和下载
 */
@RestController
@Slf4j
@RequestMapping("/common")
public class CommonController {


    @Value("${reggie.path}")
    private String basePath;
    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        log.info(file.toString());

        //原始文件名
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用UUID生成文件名，防止覆盖
        String filename = UUID.randomUUID().toString() + suffix;

        //创建一个目录文件
        File dir = new File(basePath);
        if(!dir.exists()){
            dir.mkdirs();
        }
        try {
            //将临时文件存到指定位置
            file.transferTo(new File(basePath+filename));
        }catch (Exception e){
            e.printStackTrace();
        }
        return R.success(filename);
    }

    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){

        try{
            //输入流，读取文件内容
            FileInputStream is = new FileInputStream(new File(basePath + name));
            //输出流，写回浏览器，展示图片
            ServletOutputStream out = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len=0;
            byte[] buff =new byte[1024];
            while ((len = is.read(buff))!=-1){
                out.write(buff,0,len);
                out.flush();
            }
            //关闭
            out.close();
            is.close();
        }catch (Exception e){
            e.printStackTrace();
        }

    }
}
